Vitamin d and b12

[Roo32]

What’s the link? I see people saying those low in b12 May likely have a vit d deficiency but why is this?

[Marz]

Many people in the Northern Hemisphere have low VitD. When people have absorption issues then it is likely that B12 - Folate - Ferritin - VitD will be low as well as other nutrients ... I would test first as supplementing is based on results.

[fbirder]

Here's a fairly recent paper on how autoimmune gastric atrophy (the condition that causes PA) relates to vitamin D.

ncbi.nlm.nih.gov/pmc/articl...

[Gambit62 Administrator]

not all of your vitamin D comes from sunshine - and in the winter - if you are in UK (and probably NZ) the sun actually doesn't get high enough for long enough to ensure a good vit D uptake. As you get older the skin also gets thicker and generation of Vit D gets lower.

in UK recommendation is to supplement in the winter anyway.

[JOLLYDOLLY]

I am not sure how it all works to be honest, but they all seem to work together including thyroid conditions.

I have always had a thyroid condition but my B12 deficiency/PA, iron anaemia and vitamin D deficiency were all diagnosed at the same time, about 20 years ago.

However, I am no longer iron anaemic.

In later years, my late dad was diagnosed with B12 /PA. Both my surviving sibling and late sibling have/had borderline B12 deficiencies.

[waveylines]

The bulk of your vit D is absorbed through the skin. There are small amounts of vit D in food but not sufficient to meet an individuals need. In the northern hemispere you cannot get sufficient vit D during late atumn, winter & early spring. This means many people in the northern hemispere are deficient and need to supplement during this period. Your body stores vit D so if you get plenty of direct sun onto the skin during the summer you can store it up. However in the northen hemispere often we are covered up preventing thr sun reaching our skins. We also put protective suncream on in hot weather/climates this causes a barrier to vit D production. This means that even hot climates now have lots of people with vit D deficiency.